Although he was married when they carried on a torrid affair, Fugees founder Wyclef Jean says it was bandmate Lauryn Hill’s lies about the paternity of her child that doomed the ’90s hip-hop trio.

Jean claims Hill tricked him into believing her firstborn son was his, when, in fact, the father was Bob Marley’s son Rohan.

“In that moment something died between us. I was married and Lauryn and I were having an affair, but she led me to believe that the baby was mine, and I couldn’t forgive that,” Jean writes in “Purpose,” at which The Post got a first look yesterday.

The Haitian-born Jean says the betrayal by Hill led to the band’s 1997 breakup.

“She could not longer be my muse,” he wrote. “Our love spell was broken.”

Jean admits to having many problems with his nonprofit, Yele, whose financial irregularites were first reported by The Post.

Jean, 42, performed Friday at the HK Lounge in Hell’s Kitchen with guitarist Prince Charming. The book, which is published by Harper Collins, comes out tomorrow.